From 22feb020662405c9833902d8c72803c8f5311dbd Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Wed, 15 Jan 2025 22:10:40 +0900
Subject: [PATCH] Do not expand empty DESTDIR

---
 tool/rbinstall.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tool/rbinstall.rb b/tool/rbinstall.rb
index c469ec56a4..d2b857e555 100755
--- a/tool/rbinstall.rb
+++ b/tool/rbinstall.rb
@@ -150,7 +150,7 @@ def parse_args(argv = ARGV)
   end
 
   $destdir ||= $mflags.defined?("DESTDIR")
-  $destdir = File.expand_path($destdir) if $destdir
+  $destdir = File.expand_path($destdir) unless $destdir.empty?
   if $extout ||= $mflags.defined?("EXTOUT")
     RbConfig.expand($extout)
   end